"An attempt was made to load a program with an incorrect format.” in IIS 7

Was working on an old website dev region that hadn't been used since we upgraded to IIS 7 and a 64-bit web server, and was getting this error: "An attempt was made to load a program with an incorrect format."
 
After some research I found the answer here:


The solution that worked for me was to enable 32-bit applications in the AppPool.

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